wrote in message
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On Jun 9, 8:06 pm, "Eisboch" wrote:

The Navigator had a Raytheon system on it that was calibrated for the
transducer location versus the actual hull depth.
It was accurate to 2.8 feet. Ask me why I know.

Eisboch

The simple guess would be that your boat needed 2.9? Good to see
you stop back in.. We have all been working very hard to keep it nice
while you were away...


Heh...

well, the boat drew 4.5', but with the programmed offset, I was good to
2'9". 2'8" meant I just went aground.

Eisboch